Thread: [Maemo 5] LED Flashlight / Torch Application?
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jabawok is offline jabawok
2010-01-21 , 11:40
Posts: 75 | Thanked: 125 times | Joined on Nov 2008
#73
For those wondering about burning out the LEDs or overheating / overvoltage problems, it looks like its been pretty well thought out (well done devs!)

Here is a snippet of source code from the linux kernel:
Code:
/* Must be limited to 500 ms in RX-51 */
.max_flash_timeout       = 500000,              /* us */
/* Must be limited to 320 mA in RX-51 B3 and newer hardware */
.max_flash_intensity     = 19,
/* Must be limited to 50 mA in RX-51 */
.max_torch_intensity     = 1,
and here is a snippet of source code from the flashlight app.
Code:
_("Short-circut fault detected!\nTurning off flashlight."));
                } else if (status & FLASHLIGHT_STATUS_OVERTEMPERATURE_FAULT) {
                        flashlight_status_plugin_show_notification (plugin,
                                _("Overtemperature fault detected!\nTurning off flashlight."));
                } else if (status & FLASHLIGHT_STATUS_TIMEOUT_FAULT) {
                        flashlight_status_plugin_show_notification (plugin,
                                _("Timeout fault detected!\nTurning off flashlight."));
                } else if (status & FLASHLIGHT_STATUS_OVERVOLTAGE_FAULT) {
                        flashlight_status_plugin_show_notification (plugin,
                                _("Overvoltage fault detected!\nTurning off flashlight."));
Hope that clears up any concerns.
It would still be nice to have official word from a Nokia rep concerning the mean time before failure rating of the LED modules when running at intensity=1
 

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